Chemistry Chapter 7

A net ionic equation shows all ionic species that are present in solution. True or False?

False

A precipitation reaction occurs when water is formed as a product. True or False?

False

A precipitation reaction will occur when sodium chloride is mixed with potassium nitrate. True or False?

False

An acid-base reaction always produces a salt plus carbon dioxide. True or False?

False

An insoluble compound will partially dissolve in water. True or False?

False

An oxidation-reduction reaction must involve reaction with oxygen. True or False?

False

Cl- , Br- , and I- are mostly insoluble. True or False?

False

Combustion reactions emit heat and so can be classified as endothermic. True or False?

False

Evidence of a redox reaction is when one substance transfers protons to another substance. True or False?

False

The following equation IS balanced: CH4 + 2O2 → CO2 + H2O True or False?

False

The following reaction IS balanced: AgNO3 + 2NH4Cl → AgCl + (NH4)2NO3 True or False?

False

The formation of a gas is evidence of a chemical reaction while the emission of light is not. True or False?

False

The net ionic equation for the reaction of sodium hydroxide plus hydrochloric acid is (NA+)+(CI-) -> NaCI True or False?

False

The reaction of baking soda and vinegar to produce carbon dioxide gas is an example of a precipitation reaction. True or False?

False

The reaction of carbonate ion with magnesium ion to form solid magnesium carbonate is an example of an oxidation reduction reaction. True or False?

False

A precipitate will form when you mix solutions of potassium chloride and lead nitrate. True or False?

True

A spectator ion is one that does not actively participate in a chemical reaction. True or False?

True

A strong electrolyte solution contains ionic compounds that fully dissolve. True or False?

True

Carbon dioxide gas is a product when an acid reacts with a carbonate or a bicarbonate. True or False?

True

Color change is evidence that a chemical reaction has occurred. True or False?

True

Combustion reactions are a subcategory of oxidation-reduction reactions. True or False?

True

Decomposition reactions usually require energy to initiate the reaction. True or False?

True

Evidence of a redox reaction is when a substance reacts with elemental oxygen. True or False?

True

Li+, Na+, K+ and NH4+ compounds are soluble. True or False?

True

One of the characteristics of an acid-base reaction is that this type of reaction forms water. True or False?

True

The following equation IS balanced: HNO3 + NaHSO3 → NaNO3 + H2O + SO2 True or False?

True

The following reaction IS balanced: BaCl2 + H2SO4 → 2HCl + BaSO4 True or False?

True

The formation of either a solid or a gas is evidence of a chemical reaction. True or False?

True

The key to predicting a precipitation reaction is the formation of an insoluble compound from soluble compounds. True or False?

True

When balancing a chemical equation you may alter the coefficients but not the subscripts in the equation. True or False?

True

Methane gas (CH4), on complete combustion in air, produces: 1. CO2 2. H2 3. H2O a. 1 and 3 only b. 2 and 3 only c. 1 and 2 only d. All of 1 and 2 only e. None of

a. 1 and 3 only

What are the coefficients for the following reaction when it is properly balanced? a. 1, 1, 1, 1 b. 2, 3, 2, 2 c. 5, 2, 2, 1 d. 2, 1, 1, 1 e. none of the above

a. 1, 1, 1, 1

Identify the double displacement reactions among the following: 1. KCl(aq) + AgNO3(aq) → AgCl(s) + KNO3(aq) 2. Na2SO4(aq) + BaCl2(aq) → BaSO4(s) + 2NaCl(aq) 3. H2SO4((aq) + 2NaOH(aq) → Na2SO4((aq) + 2H2O(l) a. 2 and 3 only b. 1 and 3 only c. 1 and 2 only d. All of 1, 2, and 3 e. None of 1, 2, and 3

a. 2 and 3 only

Considering the following precipitation reaction: Pb(NO3)2(aq) + 2KI(aq) → PbI2(s) + 2KNO3(aq) Which ion(s) would not be spectator ions? a. Pb2+, I - b. K+ , I- c. NO3- , Pb2+ d. Pb2+ , NO3- e. All the above ions are in the net ionic equation.

a. Pb2+, I -

Before a chemical equation can be written, one must know a. the symbols and formulas of all reactants and products. b. the atomic mass of all the elements involved. c. the number of moles of all reactants and products. d. the molar mass of all the compounds. e. none of the above.

a. the symbols and formulas of all reactants and products.

An aqueous solution is: a. water with another compound dissolved in it. b. water with a molecular compound dissolved in it. c. any liquid with another compound dissolved in it. d. an ionic compound with water dissolved in it. e. none of the above

a. water with another compound dissolved in it.

In writing the chemical equation for a precipitation reaction, what abbreviation of the physical state must appear with one of the products? a. (w) b. (s) c. (g) d. (l) e. none of the above

b. (s)

What are the coefficients for the following reaction when it is properly balanced? ___potassium iodide + ___lead (II) acetate → ___lead (II) iodide +___potassium acetate a. 2, 1, 1, 1 b. 2, 1, 1, 2 c. 1, 1, 2, 2 d. 3, 2, 2, 1 e. none of the above

b. 2, 1, 1, 2

What are the coefficients for the following reaction when it is properly balanced? ___Na3PO4 + ___Ba(NO3)2 → ___NaNO3 + ___Ba3(PO4)2 a. 6, 1, 3, 2 b. 2, 3, 6, 1 c. 2, 3, 1, 6 d. 2, 1, 1, 3 e. none of the above

b. 2, 3, 6, 1

Considering the following precipitation reaction: Pb(NO3)2(aq) + 2KI(aq) → PbI2(s) + 2KNO3(aq) Which compound would not form ions in the complete ionic equation? a. KNO3 b. PbI2 c. Pb(NO3)2 d. KI e. All compounds form ions in the complete ionic equation.

b. PbI2

Which of the following is NOT a sign of a chemical reaction? a. emission of heat b. absorbing light c. absorbing heat d. emission of light e. All of the above are signs of a chemical reaction.

b. absorbing light

Which of the following compounds is SOLUBLE? a. aluminum carbonate b. aluminum sulfate c. aluminum hydroxide d. aluminum sulfide e. none of the above

b. aluminum sulfate

Which of the following compounds is INSOLUBLE? a. magnesium bromide b. aluminum sulfide c. lithium carbonate d. potassium acetate e. none of the above

b. aluminum sulfide

A precipitate is expected to be formed when an aqueous solution of sodium sulfate is added to an aqueous solution of a. magnesium chloride b. barium chloride c. iron(III) chloride d. potassium chloride e. none of the above

b. barium chloride

What type of a reaction occurs when a hydrochloric acid solution is mixed with a sodium bicarbonate solution? a. acid-base neutralization b. gas evolution c. oxidation-reduction d. precipitation e. no reaction

b. gas evolution

What type of a reaction occurs when potassium metal reacts with fluorine gas? a. acid-base neutralization b. oxidation-reduction c. gas evolution d. precipitation e. no reaction

b. oxidation-reduction

What type of reaction is the generic equation A+B->AB? a. single displacement b. synthesis/combination c. decomposition d. double-displacement e. none of the above

b. synthesis/combination

What are the coefficients for the following reaction when it is properly balanced? ___O2 + ___CH4 → ___CO2 + ___H2O a. 2, 3, 2, 2 b. 1, 3, 2, 1 c. 2, 1, 1, 2 d. 2, 1, 3, 1 e. none of the above

c. 2, 1, 1, 2

Which of the following statements about redox reactions is FALSE? a. Oxidation is the loss of electrons. b. A reaction involving elemental oxygen is a redox reaction. c. A reaction can result in either oxidation or reduction, not both. d. Reduction is the gain of electrons. e. All of the above statement are true.

c. A reaction can result in either oxidation or reduction, not both.

When a solution of MgCl2 and one of AgNO3 are mixed, the net ionic equation is a. Mg2+(aq) + 2NO3-(aq) → Mg(NO3)2(aq) b. Mg2+(aq) + 2Cl-(aq) + 2Ag+(aq) + 2NO3- (aq) → Mg(NO3)2 (aq) + 2 AgCl(s) c. Cl-(aq) + Ag+(aq) → AgCl(s) d. Mg2+(aq) + 2Cl-(aq) + 2Ag+(aq) + 2NO3- (aq) → Mg2+(aq) + 2NO3-aq) + 2AgCl(s) e. none of the above

c. Cl-(aq) + Ag+(aq) → AgCl(s)

What is the molecular equation for the reaction of hydrochloric acid with potassium hydroxide? a. H+ + OH- → H2O b. 2HCl + K(OH)2 → 2H2O + KCl2 c. HCl + KOH → H2O + KCl d. H2Cl + 2KOH → H2O +2KCl e. none of the above

c. HCl + KOH → H2O + KCl

Considering the following precipitation reaction: Pb(NO3)2(aq) + 2KI(aq) → PbI2(s) + 2KNO3(aq) Which ion(s) would not be present in the net ionic equation? a. Pb2+ , NO3- b. K+ , Pb2+ c. K+ , NO3- d. K+, I- e. All the above ions are in the net ionic equation.

c. K+ , NO3-

When water is heated, bubbles form in the water. Is this evidence of a chemical reaction? Why? a. Yes, the formation of a gas is evidence of a chemical reaction. b. Yes, the formation of a gas is proof a new compound has been made. c. No, boiling water is a physical change. d. No, the formation of gas bubbles is a secondary chemical reaction which is ignored. e. none of the above

c. No, boiling water is a physical change.

Considering the following precipitation reaction: Pb(NO3)2(aq) + 2KI(aq) → PbI2(s) + 2KNO3(aq) What is the correct net ionic equation? a. 2NO3- + 2K+ → 2KNO3 b. Pb2+ + 2NO3- + 2K+ + 2I- → PbI2(s) + 2K+ + 2NO3- c. Pb2+ + 2I- → PbI2(s) d. Pb2+ + I2- → PbI2(s) e. none of the above

c. Pb2+ + 2I- → PbI2(s)

Considering the following precipitation reaction: Pb(NO3)2(aq) + 2KI(aq) → PbI2(s) + 2KNO3(aq) What is the correct complete ionic equation? a. Pb2+ + 2NO3- + 2K+ + 2I- → Pb2+ + 2I- + 2K+ + 2NO3- b. Pb2+ + (NO3)2- + 2K+ + 2I- → PbI2(s) + 2K+ + 2NO3- c. Pb2+ + 2NO3- + 2K+ + 2I- → PbI2(s) + 2K+ + 2NO3- d. Pb2+ + 2NO3- +2K+ + I- → PbI2(s) + 2K+ + NO3- e. none of the above

c. Pb2+ + 2NO3- + 2K+ + 2I- → PbI2(s) + 2K+ + 2NO3-

What type of a reaction occurs when a sodium hydroxide solution is mixed with an acetic acid solution? a. oxidation-reduction b. gas evolution c. acid-base neutralization d. precipitation e. no reaction

c. acid-base neutralization

What is the gas produced when hydrochloric acid is reacted with ammonium carbonate? a. chlorine b. ammonia c. carbon dioxide d. hydrogen e. none of the above

c. carbon dioxide

What type of reaction is the generic equation AB -> A + B? a. synthesis/combination b. single displacement c. decomposition d. double-displacement e. none of the above

c. decomposition

What type of reaction is the generic equation AB+CD->AD+CB? a. decomposition b. single displacement c. double-displacement d. synthesis/combination e. none of the above

c. double-displacement

A reaction which forms a gaseous product is an example of a(n)________. a. precipitation reaction b. oxidation-reduction reaction c. gas evolution reaction d. combustion reaction e. none of the above

c. gas evolution reaction

Which of the following types of compounds will not undergo a gas evolution reaction when acid is added? a. sulfides b. bisulfites c. hydroxides d. carbonates e. none of the above

c. hydroxides

Which of the following compounds is INSOLUBLE? a. magnesium nitrate b. magnesium sulfate c. magnesium phosphate d. magnesium iodide e. none of the above

c. magnesium phosphate

Which of the following compounds is SOLUBLE? a. calcium carbonate b. strontium carbonate c. potassium carbonate d. copper carbonate e. none of the above

c. potassium carbonate

What type of a reaction occurs when a silver nitrate solution is mixed with sodium chloride solution? a. acid-base neutralization b. oxidation-reduction c. precipitation d. gas evolution e. no reaction

c. precipitation

If you had an aqueous mixture that contained Ag+, K+, and Pb+2 cations, how many different solids could precipitate if a chloride solution was added? a. 1 b. no solids will precipitate c. 3 d. 2 e. 4

d. 2

What are the coefficients for the following reaction when it is properly balanced? ___HCl + ___Mg → ___MgCl2 + ___ H2 a. 1, 2, 1/2, 1 b. 1, 1, 1, 2 c. 2, 1, 2, 2 d. 2, 1, 1, 1 e. none of the above

d. 2, 1, 1, 1

What are the coefficients for the following reaction when it is properly balanced? ___nitrogen monoxide + ___carbon monoxide → ___nitrogen +___carbon dioxide a. 2, 1, 1, 2 b. 2, 2, 2, 1 c. 1, 1, 2, 2 d. 2, 2, 1, 2 e. none of the above

d. 2, 2, 1, 2

When the equation, ___N2 + ___H2 → ___NH3 is balanced, the coefficient of hydrogen is: a. 4 b. 1 c. 2 d. 3 e. none of the above

d. 3

When the equation, ___O2 + ___C5H12 → ___CO2 + ___H2O is balanced, the coefficient of O2 is: a. 5 b. 3 c. 4 d. 8 e. none of the above

d. 8

Identify the oxidation-reduction reactions among the following: 1. Zn(s) + Cu2+(aq) → Zn2+(aq) + Cu(s) 2. 2 Na(s) + Cl2(aq) → 2NaCl(s) 3. 2 Mg(s) + O2(g) → 2 MgO a. 1 and 3 only b. 1 and 2 only c. 2 and 3 only d. All of 1, 2, and 3 e. None of 1, 2, and 3

d. All of 1, 2, and 3

What is the complete ionic equation for the reaction of hydrochloric acid with potassium hydroxide? a. H+ + Cl- + K+ + OH- → 2H+ + O2- + K+ + Cl- b. 2H+ +2Cl- + K2+ + 2OH- → H2O + K2+ +2 Cl- c. H+ + OH- → H2O d. H+ + Cl- + K+ + OH- → H2O + K+ + Cl- e. none of the above

d. H+ + Cl- + K+ + OH- → H2O + K+ + Cl-

What is the net ionic equation for the reaction of hydrochloric acid with potassium hydroxide? a. 2H+ +2Cl- + K2+ + 2OH- → H2O + K2+ +2 Cl- b. H+ + Cl- + K+ + OH- → H2O + K+ + Cl- c. HCl + KOH → H2O + KCl d. H+ + OH- → H2O e. none of the above

d. H+ + OH- → H2O

Which is a spectator ion from the following complete ionic equation: Ag+(aq) + NO3-(aq) + K+ (aq) + Br-(aq) → AgBr(s) + K+(aq) + NO3- (aq) a. Br- b. Ag+ c. AgBr d. K+ e. none of the above

d. K+

All of the following compounds are soluble in water EXCEPT a. NaCl b. FeCl3 c. CaCl2 d. PbCl2 e. NH4Cl

d. PbCl2

Which of the following statements about balancing reactions is FALSE? a. Subscripts are multiplied by the coefficients to determine the number of atoms in a compound. b. Coefficients are added to compounds to ensure both sides of the reaction have equal numbers of each atom. c. If there is no coefficient or subscript, a one is implied. d. When coefficients are added the type of compounds is changed in the chemical reaction. e. All of the above statements are true.

d. When coefficients are added the type of compounds is changed in the chemical reaction.

A reaction which forms a solid product is an example of a(n)________. a. gas evolution reaction b. oxidation-reduction reaction c. combustion reaction d. precipitation reaction e. none of the above

d. precipitation reaction

What type of reaction is the generic equation A + BC → AC + B ? a. double-displacement b. synthesis/combination c. decomposition d. single displacement e. none of the above

d. single displacement

Which of the following everyday substances does not typically contain an acid? a. limes b. lemons c. vinegar d. soap e. all of the above

d. soap

A redox reaction has occurred __________. a. when one substance transfers electrons or protons to another b. when an alkali metal reacts with an alkaline earth metal c. when one substance forms a solid d. when a substance reacts with elemental oxygen e. when all of the above occur

d. when a substance reacts with elemental oxygen

Which of the following is NOT evidence that a chemical reaction has occurred? a. color change b. emission of light c. solid formation d. gas formation e. All of the above are evidence of a chemical reaction.

e. All of the above are evidence of a chemical reaction.

Which of the following statements about writing molecular, complete and net ionic equations is FALSE? a. A net ionic equation is an equation showing only the species that actually change during the reaction. b. A molecular equation is a chemical equation showing the complete, neutral formulas for every compound in a reaction. c. A complete ionic equation is a chemical equation showing all of the species as they are actually present in solution. d. A spectator ion remains unchanged in the reaction and appears on both sides of the equation. e. All of the statements are true.

e. All of the statements are true.

Considering the following precipitation reaction: Pb(NO3)2(aq) + 2KI(aq) → PbI2(s) + 2KNO3(aq) Which ion would not be present in the complete ionic equation? a. I- b. K+ c. Pb2+ d. NO3- e. All the above ions are in the complete ionic equation.

e. All the above ions are in the complete ionic equation.

Which statement about ozone is TRUE? a. Chlorofluorocarbons deplete the ozone layer. b. Ozone normally forms in the upper atmosphere. c. Ozone protects life on Earth from harmful ultraviolet light. d. None of the above statements are true. e. All the of the first three statements are true.

e. All the of the first three statements are true.

What must be supplied for most decomposition reactions to happen? a. energy b. electrical current c. light d. heat e. any of the above

e. any of the above

What type of a reaction occurs when a potassium nitrate solution is mixed with a barium acetate solution? a. acid-base neutralization b. oxidation-reduction c. precipitation d. gas evolution e. no reaction

e. no reaction